Upgrade testing for SQLite

[YC]

How it works:

1. Download release version of Wakapi
2. Run tests against release version
3. Run current build of wakapi
4. If the service can come up, it means that migrations succeeded

This PR also changes run_api_tests.sh to have two optional arguments database type and upgrade testing, which defaults to sqlite and no upgrade testing respectively.

Part of #407

[github-actions]

Mayhem for API Automated API Testing Report

✔️ 🎆 0 Errors Found

⚠️ 1 Warnings Found

Rule	Method	Path	Details
Timeout	GET	/compat/wakatime/v1/users/{user}/summaries	↗️

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Testing details and issue reproduction found at https://mayhem4api.forallsecure.com/job/20321

[muety]

Great contribution! 🙏 A few remarks:

• Can you please add a wait_for_wakapi statement before the first test run?
• Could you add another 1-2 seconds sleep to the wait function? I noticed that even when the instance is up, the first one or two test cases still fail due to connection reset
• If one of the tests fails, the Wakapi process is not properly terminated, but remains running and thus blocks the port
• The second positional argument "y" looks a bit non-intuitive for an outside user. Could you make it --migrations or so?
• Minor one: add logging before the release downloading
• Minor one: lower-case variable names (for consistency)

[muety]

Awesome contribution, thanks you so much!